cleanup and consolidate peripherals macro

embassy-extras/src/macros.rs

@@ -105,3 +105,42 @@ macro_rules! impl_unborrow {
         }
     };
 }
+
+#[macro_export]
+macro_rules! std_peripherals {
+    ($($(#[$cfg:meta])? $name:ident),*$(,)?) => {
+        #[doc = r"All the peripherals"]
+        #[allow(non_snake_case)]
+        pub struct Peripherals {
+            $(
+                $(#[$cfg])?
+                pub $name: pac::$name,
+            )+
+        }
+
+        static mut GLOBAL_CLOCKS: Option<Clocks> = None;
+
+        impl Peripherals {
+            pub fn take() -> Option<(Peripherals, Clocks)> {
+                match unsafe {GLOBAL_CLOCKS} {
+                    Some(clocks) => {
+                        let dp = unsafe { pac::Peripherals::steal() };
+                        let peripherals = Peripherals {
+                            $(
+                                $(#[$cfg])?
+                                $name: dp.$name,
+                            )+
+                        };
+
+                        Some((peripherals, clocks))
+                    },
+                    None => None,
+                }
+            }
+
+            pub unsafe fn set_peripherals(clocks: Clocks) {
+                GLOBAL_CLOCKS.replace(clocks);
+            }
+        }
+    };
+}